MY126308A - Method and system for accurate self-servowriting with normalization in a disk drive - Google Patents

Method and system for accurate self-servowriting with normalization in a disk drive

Info

Publication number
MY126308A
MY126308A MYPI97002704A MYPI9702704A MY126308A MY 126308 A MY126308 A MY 126308A MY PI97002704 A MYPI97002704 A MY PI97002704A MY PI9702704 A MYPI9702704 A MY PI9702704A MY 126308 A MY126308 A MY 126308A
Authority
MY
Malaysia
Prior art keywords
servowriting
track
indicium
written
transducer
Prior art date
Application number
MYPI97002704A
Inventor
Timothy Chainer
Mark Delorman Schultz
Bucknell Chapman Webb
Edward John Yarmchuk
Original Assignee
Hitachi Global Storage Tech Nl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Global Storage Tech Nl filed Critical Hitachi Global Storage Tech Nl
Publication of MY126308A publication Critical patent/MY126308A/en

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/012—Recording on, or reproducing or erasing from, magnetic disks
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B21/00—Head arrangements not specific to the method of recording or reproducing
    • G11B21/02—Driving or moving of heads
    • G11B21/08—Track changing or selecting during transducing operation
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B21/00—Head arrangements not specific to the method of recording or reproducing
    • G11B21/02—Driving or moving of heads
    • G11B21/10—Track finding or aligning by moving the head ; Provisions for maintaining alignment of the head relative to the track during transducing operation, i.e. track following
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/54—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head into or out of its operative position or across tracks
    • G11B5/55—Track change, selection or acquisition by displacement of the head
    • G11B5/5521—Track change, selection or acquisition by displacement of the head across disk tracks
    • G11B5/5526—Control therefor; circuits, track configurations or relative disposition of servo-information transducers and servo-information tracks for control thereof
    • G11B5/553—Details
    • G11B5/5534—Initialisation, calibration, e.g. cylinder "set-up"
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B5/584—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following on tapes
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B5/596—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following on disks
    • G11B5/59633—Servo formatting

Abstract

AN ACCURATE AND TIME-EFFICIENT METHOD AND SYSTEM FOR SELF-SERVOWRITING WHEREIN AT LEAST ONE REFERENCE VALUE USED TO POSITION THE TRANSDUCER (22) IS UPDATED FOR SOME, BUT NOT ALL, OF THE TRACKS TO BE WRITTEN. THE REFERENCE VALUE(S) IS DEPENDENT UPON A PREDEFINED INDICIUM OF TRANSDUCER (22) POSITION, SUCH AS THE AMPLITUDE OF THE READBACK SIGNAL (364) OBTAINED FROM A WRITTEN TRACK WHEN THE TRANSDUCER (22) IS POSITIONED ON THE TRACK. IN A FIRST EMBODIMENT, UPDATING OF THE REFERENCE VALUE (S) IS PERFORMED AT EVERY NTH TRACK WRITTEN, WHERE N IS A FIXED NUMBER OR RANGE OF NUMBERS DETERMINED BY AN EXPECTED TRACK-TO-TRACK VARIATION OF THE INDICIUM.THE SERVOWRITING SYSTEM MAY BE DESIGNED TO DYNAMICALLY INCREASE OR DECREASE N DURING SERVOWRITING IN RESPONSE TO ACTUAL VARIATIONS IN THE INDICIUM. ACCORDING TO A SECOND EMBODIMENT, UPDATING IS ONLY PERFORMED WHEN NEEDED, E.G. WHEN THE VARIATION OF THE MEASURED INDICIUM BETWEEN TWO WRITTEN TRACKS (NOT NECESSARILY ADJACENT TRACKS) EXCEEDS A PREDEFINED THRESHOLD VALUE.FOR SYSTEMS EMPLOYING DUALELEMENT HEADS, SERVOWRITING ACCURACY IS ENHANCED BY PERFORMING A READ HEAD ADJUSTMENT PRIOR TO UPDATING OF THE REFERENCE VALUES.(FIG 3C)
MYPI97002704A 1996-07-09 1997-06-16 Method and system for accurate self-servowriting with normalization in a disk drive MY126308A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US08/677,144 US5875064A (en) 1996-07-09 1996-07-09 Method and system for accurate self-servowriting with normalization in a disk drive

Publications (1)

Publication Number Publication Date
MY126308A true MY126308A (en) 2006-09-29

Family

ID=24717506

Family Applications (1)

Application Number Title Priority Date Filing Date
MYPI97002704A MY126308A (en) 1996-07-09 1997-06-16 Method and system for accurate self-servowriting with normalization in a disk drive

Country Status (5)

Country Link
US (2) US5875064A (en)
JP (1) JP3532382B2 (en)
KR (1) KR100270004B1 (en)
MY (1) MY126308A (en)
SG (1) SG50848A1 (en)

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Also Published As

Publication number Publication date
KR980011021A (en) 1998-04-30
US6469859B1 (en) 2002-10-22
JP3532382B2 (en) 2004-05-31
SG50848A1 (en) 1998-07-20
US5875064A (en) 1999-02-23
KR100270004B1 (en) 2000-10-16
JPH10106195A (en) 1998-04-24

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